My game is pretty laggy now. I was wondering if anybody could figure out how to make it more efficient.

Warning! This is a beta version of 7.0. It has many bugs and is very slow to run. Only download this beta if you want to look at the code and help figure out what is causing the game to lag so much.

7.0 adds:
-Mouse Control (Thanks to legolizard for the scripting.)
-Saving of Game Settings (Preserves settings so they remain the same when you run the world again. Thanks to arty-fishL's iOTool plugin.
Warning! The code in this game for saving hasn't been tested on Windows or Linux yet. It is recommended that you disable this feature or you probably will not be able to run the world. Details in the release notes on how to do this.
-Improved AI (not in this version. It will be coming in the official 7.0 release.)

Beta 2:
-Jet engine sound for player's plane (Thanks to zero00 for showing me how to change volume of sound while the sound is already playing. Volume of jet engine changes with how close the camera is to the plane.)
-Fixed turning speeds (plane turned just a little too fast in the first beta)
-Shows how to use new mouse control in tutorial